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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Product revenue | $ 10,797 | $ 10,175 | $ 27,328 | $ 27,058
Cost of product revenue | 5,348 | 5,451 | 13,402 | 14,690
Gross profit on product revenue | 5,449 | 4,724 | 13,926 | 12,368
Government contracts revenue | 2,285 | 261 | 5,380 | 261
Operating expenses: |  |  |  |
Research and development | 7,886 | 7,033 | 25,927 | 22,507
Selling, general and administrative | 12,180 | 12,161 | 39,907 | 36,314
Amortization of intangible assets | 50 | 50 | 151 | 151
Total operating expenses | 20,116 | 19,244 | 65,985 | 58,972
Loss from operations | (12,382) | (14,259) | (46,679) | (46,343)
Non-operating (expense) income, net: |  |  |  |
Foreign exchange loss |  | (61) | (59) | (77)
Interest expense | (1,090) | (586) | (2,122) | (1,899)
Other income, net | 104 | 114 | 3,722 | 293
Total non-operating (expense) income, net | (986) | (533) | 1,541 | (1,683)
Loss before income taxes | (13,368) | (14,792) | (45,138) | (48,026)
Provision (benefit) for income taxes | 50 | (416) | 3,961 | 1,379
Net loss | $ (13,418) | $ (14,376) | $ (49,099) | $ (49,405)
Net loss per share: |  |  |  |
Basic | $ (0.12) | $ (0.14) | $ (0.46) | $ (0.49)
Diluted | $ (0.12) | $ (0.14) | $ (0.46) | $ (0.49)
Weighted average shares outstanding used for calculating net loss per share: |  |  |  |
Basic | 109,846 | 102,769 | 106,159 | 101,273
Diluted | 109,846 | 102,769 | 106,159 | 101,273

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